Integrated Services Q0S

* IntServ or integrated services is an architecture that specifies the elements to
guarantee quality of service (QoS) on networks.
* IntServ specifies a fine-grained QoS system, which is often contrasted with DiffServ's
coarse-grained control system.
* The idea of IntServ is that every router in the system implements IntServ, and
every application that requires some kind of guarantees has to make an individual
reservation.
* Integrated services approach consists of two service classes
1. Guaranteed service class: - defined for applications that cannot tolerate
a delay beyond particular value. Real time applications like voice or video
communications use this type of service
2. Controlled-load service class:- defined for applications that can tolerate some
delay and loss.

The below figure shows four processes providing quality of service
1. Traffic shaping :-It regulates the traffic
2. Admission control: - It governs the network by admitting or rejecting the application
flow.
3. Resource allocation:- It allows the network users to reserve the resources on
neighboring routers
4. Packet scheduling: - sets the timetable for the transmission of packet flows.

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